LM3822 National Semiconductor, LM3822 Datasheet - Page 10

• Manufacturer Part Number: LM3822
• Description: Precision Current Gauge IC with Internal Zero Ohm Sense Element and PWM Output
• Manufacturer: National Semiconductor

www.national.com
Look-Up Tables
The following tables show how to convert the duty cycle of
the PWM output to a current value, and vice versa. The
Sense Current
(Imax = 1.0A)
−0.05
−0.10
−0.15
−0.20
−0.25
−0.30
−0.35
−0.40
−0.45
−0.50
−0.55
−0.60
−0.65
−0.70
−0.75
−0.80
−0.85
−0.90
−0.95
0.95
0.90
0.85
0.80
0.75
0.70
0.65
0.60
0.55
0.50
0.45
0.40
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0.00
−1
1
TABLE 1. Current to Duty Cycle Conversion Table
Sense Current
(Imax = 2.0A)
−0.10
−0.20
−0.30
−0.40
−0.50
−0.60
−0.70
−0.80
−0.90
−1.10
−1.20
−1.30
−1.40
−1.50
−1.60
−1.70
−1.80
−1.90
1.90
1.80
1.70
1.60
1.50
1.40
1.30
1.20
1.10
0.90
0.80
0.70
0.60
0.50
0.40
0.30
0.20
0.10
0.00
−1
−2
10
2
1
quantization error of
Please see the “PWM Output and Current Accuracy” section
for more details.
1
⁄
Duty Cycle (%)
2
bit is not shown in these tables.
95.5
93.2
90.9
88.6
86.4
84.1
81.8
79.5
77.3
75.0
72.7
70.5
68.2
65.9
63.6
61.4
59.1
56.8
54.5
52.3
47.7
45.5
43.2
40.9
38.6
36.4
34.1
31.8
29.5
27.3
22.7
20.5
18.2
15.9
13.6
11.4
9.1
6.8
4.5
50
25